Jobs and Careers
NE

Senior Mechanical Engineer

Nevada National Security Sites
United Statesfull_timeVerifiedPosted 24 Sept 2025
💰 $149,011/yr($99,341/yr$149,011/yr)

About the role

Mission Support and Test Services, LLC (MSTS) manages and operates the Nevada National Security Site (NNSS) for the U.S. National Nuclear Security Administration (NNSA).  Our MISSION is to help ensure the security of the United States and its allies by providing high-hazard experimentation and incident response capabilities through operations, engineering, education, field, and integration services and by acting as environmental stewards to the Site’s Cold War legacy.  Our VISION is to be the user site of choice for large-scale, high-hazard, national security experimentation, with premier facilities and capabilities below ground, on the ground, and in the air. (See NNSS.gov for our unique capabilities.) Our 2,750+ professional, craft, and support employees are called upon to innovate, collaborate, and deliver on some of the more difficult nuclear security challenges facing the world today.   

  • MSTS offers our full-time employees highly competitive salaries and benefits packages including medical, dental, and vision; both a pension and a 401k; paid time off and 96 hours of paid holidays; relocation (if located more than 75 miles from work location); tuition assistance and reimbursement; and more.  
  • MSTS is a limited liability company consisting of Honeywell International Inc. (Honeywell), Jacobs Engineering Group Inc. (Jacobs), and HII Nuclear Inc.

MSTS is seeking a Senior Mechanical Engineer for a Facility/System Engineering position at our Device Assembly Facility (DAF).  The DAF is the largest nuclear facility located within the Forward Areas of the Nevada National Security Site (NNSS) that supports Stockpile Stewardship mandates and related Experiments performed by the National Weapons Laboratories.

Key Responsibilities

  • Responsible for maintaining overall cognizance of assigned facility systems, providing systems engineering support for operations and maintenance, and technical support of line management safety responsibilities for ensuring continued system operational readiness.  This includes directing junior engineers in the performance of this function.
  • Validates physical configuration of assigned systems. Maintains and updates system documents for Configuration Management (CM). Understands the functions and performance criteria for assigned systems per the Safety Basis, and acts as the subject matter expert for assigned systems.
  • Supports the In-service-Inspection and Technical Surveillance Requirement execution of assigned systems.
  • Contribute to solutions of assignment-related problems and issues with a limited scope and basic complexity, using a well-defined set of technologies. Solutions use established basic standards, practices and procedures as well as technical knowledge to address problems and complete tasks.
  • Participate in developing field programs and designs using pre-determined principles and practices.
  • Contribute to designs, strategies, reports and technical proposals.
  • Perform design and technical analysis activities using prescribed codes and standards, computer software, and generally accepted best management practices. This will include more complex problems and analysis.
  • Assist in defining specifications for procurements and initiate purchase requests.
  • Work with outside vendors as required obtaining relevant information.
  • Develop a working knowledge of codes and standards of other disciplines.
  • Coordinate work within their discipline on moderately complex projects.
  • Often serves as a member of work teams.
  • May monitor work of and provide guidance to skilled technicians and other support personnel.
  • Provide direction, assistance, and mentor early career engineers.
  • Bachelor’s degree in an engineering program accredited by the Accreditation Board for Engineering and Technology (ABET) required for Civil, Mechanical and Electrical engineering degrees
    • Or, Calculus-based STEM bachelor’s degree in engineering
    • Or, for Architects, Certification from the National Council or Architectural Registration Board (NCARB)
    • Or Professional Engineer license
  • Plus at least 5 years’ relevant experience. Skill building experience must demonstrate either deeper technical specialization or additional cross-disciplinary knowledge; graduate research experience may be recognized.
  • Knowledge of how codes and standards of other disciplines affect their discipline.
  • Demonstrated desire to learn and innovate.
  • Demonstrated ability to follow instructions and procedures.
  • Knowledge of instrumentation & control, electrical, mechanical or electromechanical components.
  • Should be self-motivated and able to complete assigned tasks with little to no supervision.
  • Ideally, the applicant will have strong time-management skills.  Be well organ

Apply for this role

Generate a tailored application kit with a matched cover letter, interview prep, and CV highlights — in under 60 seconds.

Apply Now →Generate Application Kit

Free account required — sign up in 30s

Company

Nevada National Security Sites

View company profile →